Compressor valve



July 3, '1923.

F. w. PARSONS COMPRESSOR VALVE 3 Sheets-Sheet l A lll INVENTOR July 3, 1923.; Y 1,460,824

. F. W. PARSONS COMPRESSOR VALVE- Filed Jam 14 1922 3 sheets-sheet 2 ATTOREY July' s, 1923. h 1,460,824-

V F. w. PARSONS COMPRESSOR VALVE Fi1egi'Jan. v1/,1.1922 v s sheets-sheet .lilv

HisATTo NEY l' FREDERICK W. FARSONS, F ELMIBA, NEW YORK, ASSIGNOR T0 INGERSOLL-B COMPANY, 0F JERSEY CITY, NEW JEY, CORBORATION 0F NEW FEBS COMPRESSUR, VALVE.

Appliwtlonled January 14, 1922. Serial No. 529,283.

To all whom it may comem.'

Be it known that I, FREDERICK W. PAR- soNs, a citizen of the United States, and a resident of Elmira, county of Chemung,

and4 State of New York, have invented a' certain Compressor Valve, of which the following is a specification accompanied by drawings.

This invention relates to compressors, but 10 more particularly to a valve for controlling the inlet and discharge of the cylinder.

. One of the objects ofthe invention is to enable both the inlet and discharge-of the compressor to be controlled by means of one mechanically operated valve, which may preferably have several parts, as for instance a main valve member and an auxiliary valve member carried thereby, although theJ invention is not to be limited to any parn ticular type or construction `of valve.

compression. By this means, the v alve may be manually adjusted for controlling variable pressures so that the discharge opening occurs when the pressure in the cylin, der substantially coincides with'the pressure in the discharge passage, although such a mechanically operated valve could be constructed to automatically vary the said discharge opening, without departingI from the spirit of my invention as defined in this '35 specification and in the appended claims.

'ln the drawings, in which one preferred embodiment of the invention is shown,

Figure 1 is a top plan view, partly in' horizontal section o so much of a compresto sor and valve and valve gear as will serve to illustrate the invention.

Figure 2 isa side elevation of the partsof the machine shown in Figure 1, partly broken away for simplicity, v

Figure 3 is an enlarged detail horizontal sectional view through the cylinder and valve chest shown in Figure 1, with the discharge at the opening point for one adjustment of the valve,

5 Figure 4 isha view similar iso-'Figure 3,

with the valve so adjusted that the point of opening-oy the discharge will later in the cycle of operations than in Figure.

Figures 5, 6, 7 and 8 `are diagrammatic views partly in horizontal. section'showing the relative positions of the piston and valve through dii'ere'nt parts o the piston stroke.- -For clearness of illustration theA valve actuating cams in these gures are shown as if they were in horizontal planes instead of in their proper vertical planes.`

Referring to the drawings, the compressor cylinder A, having the intake B is provided with the reciprocating piston C driven in any suitable manner from the crank l).l The cylinder is provided with a valve chest E in which a piston valve reciprocates for controlling both the inlet and dischargeof the cylinder.v

In this inst-ance, the piston valve comprises the main valve member orpiston F having closed ends and the auxiliary valve, member, in the form of adjustable slides G and H, which may be moved to and from each other within the main valve member F by suitable mechanism. The discharge takes place from the valve chest through the discharge 'pipe J and .the main valve member F preferably slides within the ported l f sleeve K. A

Any suitable operative devices and webchanism may be provided for mechani ally actuating'the membersv of the compressor -`'valve from the main and auxiliary eccentrics L and 0 onthe crank shaft P. In this through which the auxiliary valve Arod X- rotata'bly extends but is held from longirlhe slides G and 4H forming the auxiliary valve member are threaded onto the reversely screw threaded portions a and b of the valve rod X and means are provided for rotating the valve rod X in one direction or the other in order to adjust the distance between the slides G and H The slides G and H, when being adjusted are prevented from turning owing to engagement of the webs c and d with the main valve rods T and U. In this instance, a screw threaded portion e of the auxiliary valve "rod X within the end ofthe arm W engages a screw f having' a pointer g cooperating with a dial h.

instance, the main eccentric strap Q is piv- .tudinal movement by means of the nuts Y.

rotated by any suitable Wrench or crank vapplied to the squared end j.

. ppintu of the discharge, and theseslidesGand are adjusted at the proper distance apart to vary the point of opening of the discharge for different ratios of compression. The

' main and auxiliary eccentrics L and O are set at such an angle and in proper relation with the crank pin D that the required timing of the main and auxiliary valve members is obtained.

ln Figures l and 3, the compressor valve is shown in a position in which air is being admitted behind the piston C, through the port 7c, Ias the piston travels forward, while the slide H has opened the discharge through the porto from the opposite end of the cylinder. In Figure 4, all the parts are in the same position as that indicated in Figure 3, except that theoauxiliary valve rod X has been rotated to adjust the slides G and H further apart so that the discharge willv be opened later in the stroke, giving suitable condition for higher discharge pres` sure.

ln Figure 5 thepiston C is at the beginning of its stroke and the main and auxiliary valve members are in neutral position, with both the intake and discharge shut off. ln Figure 6 the piston C has started on its forward stroke, the intake is open through the port and the discharge through the port o has been opened bythe slide H. In Figure 7 the piston C has reached the end of its forward stroke and the main valve chamber or valve piston F has closed the discharge through the port o, and is about to open the port o to the intake.

-. ln Figure 8 the port o is shown open to intake in front of the piston, and the slide G, now traveling in the reverse direction to that indicated in Figure 6, has opened the discharge behind the piston Cthrough the port 7c. This cycle of operations will continue as the piston C reciprocates, the main c valve member F continumg to control the opening and closing of the intake, and also the closing of the discharge at the end of the stroke, which is not varied. Likewise, the auxiliary valve member constituted by the slides G and H controls the opening point of discharge, which opening. ointmay e adjusted for dierent ratios o compression.

neecsaa l claim.: i

1. ln a compressor, the combination withy the cylinder and piston, of a mechanically operated combined inlet and discharge valve for the cylinder2 comprising a main valve member controlllng theclosing of the discharge at the end of the piston stroke and having closed ends, which control the openin and closing of the intake, an auxillary va ve member carried by the main valve .member and controlling the opening-point of discharge from the cylinder, and means for adjusting said auxiliary valve member -to vary the opening point of discharge.y

2. In a compressor, the combination with the cylinder and piston, of a mechanically operated combined inlet and discharge valve operated combined inlet and discharge valve for the cylinder, comprising a main valve member and an auxiliary valve member operatively connected to an auxiliary valve rod carried thereby, means for relatively adjusting said main and auxiliary valve member to vary the opening point of the discharge from the cylinder, and means for indicating .the pressures in the cylinder comprising a screw engagin a threaded portion of the auxiliary va ve rod, a pointer connected to the screw, and a graduated dial cooperating with the pointer, whereby relative adjustment of the main and auxiliary valves may be accurately determined for dir'- ferent ratlos of compression.

4. In a compressor, the combination with the cylinder and iston, of a mechanically operated combine inlet and discharge valve for the cylinder, com rising a main valve member having close ends controlling the Yopening and closing of the intake, and the closing of the discharge at the end of the piston stroke, an auxiliary valve member carried by the main valve member and controlling the opening point 'of the discharge from the cylinder, and means for adjusting said auxiliary valve member to vary the said opening point of the discharge.

5. In a compressor, thecombination with the cylinder and piston, of a mechanically operated combined inlet and discharge valve for the cylinder, comprising aemain valve local lso trolling the .opening point of dischar e from the cyllnder, means for adjusting sai auxiliary valve member to Vary the said o ening` point of the discharge, and means orindicating the pressures in the compressor' cyl- 1 inder connected to the said adjustin means, whereby relative adjustment of t e main and auxiliary Valves may be determined for diferent ratlos of compression.

Tn testimony whereof I have signed this` specification.

FREDERICK WQ PARSONS. 

